Method of and apparatus for pointing rods



Patented Feb. 17', 1925.

JOHN W. FREE,

OF WDODLAWN, PENNSYLVANIA.

PATENT "OFF ICE.

METHOD OF AND APPARATUS FOR POINTING RODS.

a lication filed min, 1923. serial in. 661,631.

To all whom it may concern: 7 I Be it known that I, J OHN W. FREE residing at Woodlawn, in the county of l3eaver and State of Pennsylvania, a citizen of the 5 United States, have invented-or discovered certain new and useful Improvements in Methods of and Apparatus for Pointing Rods, of. which improvements the 'following is a specification.

My invention relates to improvements in methods of and apparatus for pointing rods. It finds application in the pointing of rolled metallic rods, preparing them for introduction into the die-block in which the rolled rod is drawn to wire. The objectof my invention is the rapid production of a point of superior quality.

The inggntion is ilipstrgted iifi the accoman in awin i isa ra enta iev in front ele t atiom and Fig. I in vert i cal and transverse section of the pair of power-driven rolls which constitute the ointing machine. Fig. III'is a view simiar to Fig. II, Figs. II and III together illustrating successive stages in the ointforming operation. Figs. IV and are views to lar or scale showin the roll pass and materia in course of s aping within the roll pass. Fig. IV is a view in vertical 80 section on the plane coincident with the roll axes and accordingly transverseto the axis of the material; Fig. V is a view in vertical "section onthe plane coincident with the axis of the material. Figs. VI and VII are II spectively and illustrating a further ste in the performance of the method. Fig. VIII is a view in elevation of the'finished article, the pointed end of a rod, ready for insertion in a draw-block. A 7

Referring first to Figs. I and II, the pointing machine in which and in the operation of which my invention is achieved consists essentially of a pair of powerdriven rolls 1 and 2, rotating constantly in the directions indicated by the arrows, Fig. II. The faces of these with a-plurality of circumferential recesses. These recesses are of graded size, diminishinglfrom rightto left, as seen in'Fig. I. ach circumferential recess is made up of two parts: a part 3 of larger dimensions, and. a art 4 of smaller dimensions, and at the points where these parts join there is a -ally eject the rod views corresponding to Figs. IV andV re-' rolls are formed region 5 of tapering cross-section. The ro ls are so set and the succession of recesses so arranged that the corresponding portions of the recesses come to re 'ster as the rolls rotate. The larger portions 3 of the recesses cooperate to form an opening of such size that the material may be introduced tion Fig. II), while the rolls continue to rotate, so that the material comes to position, as indicated at R, Fig. II, ready to be acted upon.

It is the smaller portions of the circumferential recesses the portions 4;, which cooperate to form the elfective and materialreducing roll-pass. It will be perceived, on examinin Fig. II with care, that the material R introduced between the rolls and brought to the position shown, will presently, as the rolls continue to rotate, be 'owerfully grasped between the opposite aces of the narrowed pass. The material will be so grasped at a point remote from its tip, at the .point 7". And it will be perceived that as the rolls, having so gripped the material R, continue in rotation, they will roll the rod down, beginning at the point 1' and continuing to the free left-hand endof the rod, and that as they roll, they will gradufrom the roll pass in a left-to-right direction. Fig. III illustrates, when brought into comparison with Fig. II, the operation just described.

In operation an attendant thrusts in the material, R, while the large portions of the recesses are in register, to the position indicated in Fig. II. Rolling follows and the rod is ejected, its end ,havm been reduced somewhat. The attendant t en, when the larger portions of the recesses are again in register, re-introduces the tip of the rod, into the same pass, but before re-introduction he turns the rod on its axis through a quarter turn, or substantially so. The rolls then re eat their operation.

aving begun the pointing operation in a larger pass, say the pass on the extreme right, Fig. I, and having so efi'ected rolling twice repeated, or more, the attendant proceeds similarly to introduce the rod and to cause it to be rolled in the succeeding passes to 'the left. But into each succeeding pass he introduces the material to a point short of that where the rolls in the preceding pass through the opening in right-to-left direcen aged the material. Referring to Fig. V II, in the first pass the rolls engaged the material at 1', in the second at s, in the third at t, and so on.

All that I have up to this point described is already known to the art.

A difiiculty with this machine as it hitherto has been constructed, and with the operation as it hitherto has been conducted, is that in rolling the tip of the rod fins of metal are spread between the rolls on either side of the grooves 4, and these fins extend from opposite'sides of the partially rolled point. As in the progress of rolling the article is turned and rolled again, these fins are folded upon and crushed into the surface of the article. The result is a point which is of a splintering structure, weak, easily shape according to my 7 VI and VII, the same roll pass is sh broken, and-breaking in a ragged break, and on such account unsatisfactory and productive of difii'culty when it comes to ins'ertion into a draw-block and to subjection to wire-drawing instrumentalities and wire-drawing strains. My invention consists in a modification in roll configuration and a corresponding mddification in the pointing operation, in consequence of which the point which is formed, instead of being of splintered structure, is massive and coherent throughout. It will not splinter and break, and serves well in the wire-drawing apparatus.

My invention will best be understood by considering Figs. IV-VII. I form the recesses 4: in the roll faces, not as simple semicircular recesses, as hitherto they have been. I form them as recesses which are in the main, and essentially, semi-circular. But'I bevel the corner where the surface of the recess meets the general surface of the roll. This is indicated at 6. I do not limit myself .to particular proportions, but it will be observed in Fig. IV, that this bevel cuts away on either side about 30? of the semi-circular curvature of groove 4, and is inclined at an angle of 30 or more to the cylindrical face of the roll body. Such proportioning is adequate to accomplish my ends.

The rolls being so particularly shaped, the rolling operation will readily be understood. In these Figures IV -VII the lines a indicate the original contour of the rod. The first rolling eifects modification in cross-sectional shape, from the dotted circle a,Fig. IV, to the smaller circle with lateral bulges or protrusions which appears in full lines and cross-hatched. Instead of the fins developed along either side of the article between the rolls as hitherto shaped, the article under. treatment between the rolls modified in invention has low broad rounded protrusions b.

Proceeding now to consideration of Figs. own,

also the same groove. But in Figs. IV andV size, the recesses of the two series the first operation upon the material is illustrated, and in Figs. VI and VII the second. After the rolls have acted; once on the material, in the manner illustrated in Figs. IV and V and now described, the material is turned through a quarter turn and introduced again into the same roll-pass, and there undergoes the particular shaping illustrated in Figs. VI and VII. Consideration of Figs. VI and 'VII will show that the roll surfaces at engaging the surface of the material from the point a to the point (l, while the crushing strain exerted upon the protuberance 6 beginning at the point continues to the very middle of the pas at point 7. The body of the rod is thus securely held; the crushing strains come vertically uponthe protuberance b. It is not folded over, but is crushed down into the body of the ma- ,terial. The surplus metal is taken care of, not in developing a new protruslon, but in extension in length. Thus, instead of the the very middle of the pass are defective splintered structure of the point as rolled'hitherto in machines of this sort, I produce a point which is solid and coherent and integral throughout. y

In other respects the pointing operation is that well known and-indicated above.

In Fig. VIII I have purposely exaggerated the stepped configuration of the point. I have done this to bring out more clearly the characteristics of the invention. It'will be understood thatthe point as actually developed tapers more gradually than my diagrammatic figure would indicate.

I claim as my invention:

1. In a rodi-pointingmachine rolls mounted for cooperation, vided with a series-of recesses of a pair of each procooperating to form a succession of roll passes, the grooves which form the successive rollpasses being in individual cross-section semicircular, with beveled edges.

2. In a rod-pointing'machine including in its structure a pair of continuously rotating grooved rolls, the grooves. extending circumferentially and in continuity around the roll bodies and being throughout part of their extent widened to allow free passage of the material and in part narrowed to enage and reduce the material, the grooves throughout the narrowed portion of their extent being bevel-edged.

3. The method herein described of pointing a rod which consists in rolling repeatedly and with quadrant tip to the tip between grooved rolls whose grooves are semi-circular wi th beveled edges.

4. The method herein described of pomting the end of a rod which consists in causing the rod to be engaged between rolls at a point remote from its tip and rolled and its tip turns between v successive rollings from points adjacent the graduated 1a! in .cross section wit elongated from the point of initial engageprotrusions into the body of the material, ment to the tip and brou%ht to a shape clrcuwithout folding. 1

opposite pounded In testimony whereof-I have hereunto set protrusions, and then causing it to'be enmy hand.

I gag'ed a second time between rolls at a point- JOHN W. FREE.-

remote from the tip and rolled and elon Witn: gated fromsuch point of engagement to the JOHN W. Tnoms;

tip, and in such second rolling sinking said Y Y J. J 

